Abnormal behavior of MicroBlaze

Dear all
I've written a simple code to run on microblaze processor (using EDK software). This code simply write some data into different FSL ports. When i define two different variables, namely pathlen[6][6] and data, everything goes well, but when i define some extra variables, the last FSL operation doesn't work. I can't understand what is the relation between a defined variable and a write_into_fsl() operation!!! The codes are as follow:

The code that runs well:
//////////////////////////////////////////////////////////////

#include "xparameters.h"

#include "xutil.h"

#include "core_0.h"

//====================================================

int main (void) {



/*
* MemoryTest routine will not be run for the memory at
* 0x00000000 (dlmb_cntlr)
* because it is being used to hold a part of this application program
*/


//int pathlen[6][6],path[100][6],fx[100],pos[2],posmax[2],child[2][6];
//int i,j,min_index,min_val,data=2;
//int city[6];

int data=2;
int pathlen[6][6];

pathlen[0][0]=0;
pathlen[0][1]=16;
pathlen[0][2]=9;
pathlen[0][3]=13;
pathlen[0][4]=11;
pathlen[0][5]=10;

pathlen[1][0]=16;
pathlen[1][1]=0;
pathlen[1][2]=15;
pathlen[1][3]=7;
pathlen[1][4]=6;
pathlen[1][5]=2;

pathlen[2][0]=9;
pathlen[2][1]=15;
pathlen[2][2]=0;
pathlen[2][3]=19;
pathlen[2][4]=15;
pathlen[2][5]=17;

pathlen[3][0]=13;
pathlen[3][1]=7;
pathlen[3][2]=19;
pathlen[3][3]=0;
pathlen[3][4]=5;
pathlen[3][5]=10;

pathlen[4][0]=11;
pathlen[4][1]=6;
pathlen[4][2]=15;
pathlen[4][3]=5;
pathlen[4][4]=0;
pathlen[4][5]=19;

pathlen[5][0]=10;
pathlen[5][1]=2;
pathlen[5][2]=17;
pathlen[5][3]=10;
pathlen[5][4]=19;
pathlen[5][5]=0;

write_into_fsl(data,0);
read_from_fsl(data,0);

write_into_fsl(data,1);
read_from_fsl(data,1);

write_into_fsl(data,2);
read_from_fsl(data,2);

srand(pathlen[0][1]);

data=20;
write_into_fsl(data,0);

return 0;
}
///------------------------------------------------------------------


The code that work abnormally by not executing the last write_into_fsl() instruction (The only difference between this code and the previous one is in the number of variables defined. The extra variables are not used in this code)

//-----------------------------------------------------------------------------------
#include "xparameters.h"

#include "xutil.h"

#include "core_0.h"

//====================================================

int main (void) {



/*
* MemoryTest routine will not be run for the memory at
* 0x00000000 (dlmb_cntlr)
* because it is being used to hold a part of this application program
*/


int pathlen[6][6],path[100][6],fx[100],pos[2],posmax[2],child[2][6];
int i,j,min_index,min_val,data=2;
int city[6];

//int data=2;
//int pathlen[6][6];

pathlen[0][0]=0;
pathlen[0][1]=16;
pathlen[0][2]=9;
pathlen[0][3]=13;
pathlen[0][4]=11;
pathlen[0][5]=10;

pathlen[1][0]=16;
pathlen[1][1]=0;
pathlen[1][2]=15;
pathlen[1][3]=7;
pathlen[1][4]=6;
pathlen[1][5]=2;

pathlen[2][0]=9;
pathlen[2][1]=15;
pathlen[2][2]=0;
pathlen[2][3]=19;
pathlen[2][4]=15;
pathlen[2][5]=17;

pathlen[3][0]=13;
pathlen[3][1]=7;
pathlen[3][2]=19;
pathlen[3][3]=0;
pathlen[3][4]=5;
pathlen[3][5]=10;

pathlen[4][0]=11;
pathlen[4][1]=6;
pathlen[4][2]=15;
pathlen[4][3]=5;
pathlen[4][4]=0;
pathlen[4][5]=19;

pathlen[5][0]=10;
pathlen[5][1]=2;
pathlen[5][2]=17;
pathlen[5][3]=10;
pathlen[5][4]=19;
pathlen[5][5]=0;

write_into_fsl(data,0);
read_from_fsl(data,0);

write_into_fsl(data,1);
read_from_fsl(data,1);

write_into_fsl(data,2);
read_from_fsl(data,2);

srand(pathlen[0][1]);

data=20;
write_into_fsl(data,0);

return 0;
}